ML 12 V Solenoid

A magnetic-locking (ML) solenoid is a switching device that maintains its state (ON or OFF) without requiring continuous current. Unlike monostable solenoids that consume power to stay activated, the ML solenoid only draws a very low current (<13mA @ 25°C) during state changes, optimizing the energy efficiency of your electrical system.

This BLUE SEA ML solenoid (part number 7718-BSS) is designed to operate with 12V DC electrical systems. The maximum contact circuit voltage is 16V DC.

The silver alloy contacts in this solenoid provide high reliability for switching live loads. Silver is an excellent conductor, and the alloy improves wear and corrosion resistance, ensuring durable and stable performance even with high currents.

No, the BLUE SEA ML 12V solenoid model 7718-BSS is a unit without an integrated manual control. It is designed to be operated remotely via an external switch. Models 7713 or 7717 from the ML series include a manual control function.

This solenoid has a mechanical endurance of 100,000 cycles. Additionally, it offers a switching resistance of 10,000 cycles at 300A under 12V DC, ensuring a long lifespan in normal use.

This solenoid meets the external ignition protection requirements of ISO 8846 and SAE J1171. It is also CE marked and rated IP66, meaning it is protected against powerful water jets and dust, making it suitable for marine environments.

The solenoid is equipped with tinned copper connection studs sized 3/8"-16 (M10). These studs maximize conductivity and corrosion resistance, and are designed to accept 3/8" (M10) cable lugs.

The solenoid should be installed as close as possible to the battery bank. This minimizes voltage drop and optimizes the performance of the electrical system. Professional electrical installation is strongly recommended.

The solenoid requires a remote control switch of type SPDT (Single Pole Double Throw) or SPST (Single Pole Single Throw). This switch must be installed in a convenient location, near other electrical controls or the companionway, for quick access in case of emergency.

The maximum recommended torque for terminal studs is 15.8 N·m (140 in-lb). It is critical to respect this torque to ensure a solid electrical connection and avoid damaging the terminals.

Before starting the installation, it is imperative to disconnect all negative battery connections. Additionally, any unused control wires must be carefully isolated from each other and from accidental contact using heat-shrink tubing or insulating tape to prevent malfunctions.

The control circuit for this 12V DC solenoid requires an input voltage between 9V DC and 16V DC. Ensure the control switch supply voltage stays within this range.

For high-current applications, the recommended wiring is as follows:

For 1000A (30 sec peak) / 400A (5 min intermittent) / 225A (continuous): 2/0 AWG (70 mm²)

For 1100A (30 sec peak) / 400A (5 min intermittent) / 300A (continuous): 4/0 AWG (120 mm²)

For 1450A (30 sec peak) / 700A (5 min intermittent) / 500A (continuous): 2x 4/0 AWG (2x 120 mm²)

To prevent any malfunctions, it is crucial to carefully insulate all unused control wires. Use heat-shrink tubing or insulating tape to protect them from accidental contact with each other or with other components. External contact or a short circuit between control wires can lead to incorrect operation of the solenoid.

Yes, the BLUE SEA ML 12V solenoid (7718-BSS) is designed for marine environments. It is rated IP66, meaning it is protected against powerful water jets and dust, making it weather-resistant and suitable for installation in exposed areas.

No, model 7718-BSS is specifically designed for 12V DC systems. For 24V DC systems, you should choose a Blue Sea Systems ML series solenoid from the 7719 range, which is rated for this voltage.

The solenoid terminal studs are sized at 3/8"-16 (M10). Therefore, compatible cable lugs must have a hole diameter of 3/8" (M10). It is also important to ensure there is at least 1.18" (30 mm) clearance around the lug for proper installation.

A magnetic latching solenoid (ML) is a bistable device that uses a magnetic latching mechanism to maintain its state (open or closed) without requiring continuous current. Unlike monostable solenoids that consume power as long as they are activated, the BLUE SEA 12V ML solenoid only draws a very low current during the state change (about 20 ms) and no continuous consumption once the state is set.

The main advantages are:

Energy efficiency: Reduces battery current draw, which is critical for marine applications where power is precious.Reliability: Less heat generation and less stress on the electrical system.Safety: Maintains its position even in the event of a loss of power in the control circuit.